> I take it that picking # over $ is a purely stylistic preference. "#" returns a scalar and "$" returns a vector. Each of these applied monadically to a vector will give the same number but applied to anything of lower or higher dimension will return different answers entirely.
'a';'few';'words';<'squ',:'are' +-+---+-----+---+ |a|few|words|squ| | | | |are| +-+---+-----+---+ $ &> 'a';'few';'words';<'squ',:'are' NB. Shape of each 0 0 3 0 5 0 2 3 # &> 'a';'few';'words';<'squ',:'are' NB. Tally of each 1 3 5 2 On Sun, Nov 4, 2012 at 12:31 AM, Michal D. <michal.dobrog...@gmail.com>wrote: > Thank you everyone for the comments and encouragement. > > I think Bo's (?]) and accompanying code was an interesting illustration of > a nice use of the hook. I'm not sure why to prefer doubling an entire > array as opposed to dividing a single scalar? I think that inlining getx > and gety is anti-style ;-). See also all the argument unwrapping that > happens in the new revise. Too bad there is no way to prevent this. > > I take it that picking # over $ is a purely stylistic preference. I > appreciate all the comments regarding coppula and NB.*, both sound like a > good idea. > > The historical comments regarding a hook conjunction exactly mirror my > frustrations. Thank you Raul also for arcsX2, that is a thing of beauty > =). > > New and improved code at http://pastebin.com/fzs0GAev with an expanded > intro to "CSPs". > > Cheers, > > Mike > > On Thu, Nov 1, 2012 at 10:01 PM, Michal D. <michal.dobrog...@gmail.com > >wrote: > > > Hi All, > > > > I've managed to write my first not-completely-trivial program in J. It > > implements an arc consistency algorithm ( > > http://en.wikipedia.org/wiki/Local_consistency#Arc_consistency). I > would > > appreciate any comments regarding style, what I'm doing wrong in J or how > > to improve the code. I also have a couple of questions of my own: > > > > 1) how do I avoid @ especially once we remove explicit arguments? > > 2) how do I avoid constant boxing/unboxing due to fill (see arcsX)? > > 3) Is a boxed value always a pointer? One could imagine implementing > > 'ragged' arrays without pointers. > > 4) Is there a good way to have named variables (ie. avoid getx, gety)? > > 5) Why is a hook the default and not composition? > > > > Code at: http://pastebin.com/k4XuKfFi > > > > Cheers! > > > > Mike > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
